Mercurial > hg
view mercurial/hook.py @ 45551:4c8d9b53b1c7
chg: make is possible to call by default an hg binary located next to chg
When a single version of hg is in use and it's in the PATH, using chg
is just a matter of calling chg.
But when there are multiple installations of hg+chg around, and hg is
referred to with an absolute path, using chg is more annoying because
it requires both changing the invocation to hg to use chg, but also
setting CHGHG.
Currently, we set HGPATH when we build chg to remove the need to set
CHGHG in the previous paragraph. But that means chg now hardcodes its
installation path, which makes the installation not relocatable. Hence
this proposal to make chg find ./hg relative to itself (as opposed to
CHGHG=./hg which find hg relative to cwd).
This only works on linux as written, but since it's opt-in, it sounds
fine.
Tested by hand, as I'm not sure how else to test this.
Differential Revision: https://phab.mercurial-scm.org/D9006
author | Valentin Gatien-Baron <vgatien-baron@janestreet.com> |
---|---|
date | Thu, 03 Sep 2020 11:07:47 -0400 |
parents | fd3b94f1712d |
children | b3e8d8e4a40d |
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# hook.py - hook support for mercurial # # Copyright 2007 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import contextlib import os import sys from .i18n import _ from .pycompat import getattr from . import ( demandimport, encoding, error, extensions, pycompat, util, ) from .utils import ( procutil, resourceutil, stringutil, ) def pythonhook(ui, repo, htype, hname, funcname, args, throw): '''call python hook. hook is callable object, looked up as name in python module. if callable returns "true", hook fails, else passes. if hook raises exception, treated as hook failure. exception propagates if throw is "true". reason for "true" meaning "hook failed" is so that unmodified commands (e.g. mercurial.commands.update) can be run as hooks without wrappers to convert return values.''' if callable(funcname): obj = funcname funcname = pycompat.sysbytes(obj.__module__ + "." + obj.__name__) else: d = funcname.rfind(b'.') if d == -1: raise error.HookLoadError( _(b'%s hook is invalid: "%s" not in a module') % (hname, funcname) ) modname = funcname[:d] oldpaths = sys.path if resourceutil.mainfrozen(): # binary installs require sys.path manipulation modpath, modfile = os.path.split(modname) if modpath and modfile: sys.path = sys.path[:] + [modpath] modname = modfile with demandimport.deactivated(): try: obj = __import__(pycompat.sysstr(modname)) except (ImportError, SyntaxError): e1 = sys.exc_info() try: # extensions are loaded with hgext_ prefix obj = __import__("hgext_%s" % pycompat.sysstr(modname)) except (ImportError, SyntaxError): e2 = sys.exc_info() if ui.tracebackflag: ui.warn( _( b'exception from first failed import ' b'attempt:\n' ) ) ui.traceback(e1) if ui.tracebackflag: ui.warn( _( b'exception from second failed import ' b'attempt:\n' ) ) ui.traceback(e2) if not ui.tracebackflag: tracebackhint = _( b'run with --traceback for stack trace' ) else: tracebackhint = None raise error.HookLoadError( _(b'%s hook is invalid: import of "%s" failed') % (hname, modname), hint=tracebackhint, ) sys.path = oldpaths try: for p in funcname.split(b'.')[1:]: obj = getattr(obj, p) except AttributeError: raise error.HookLoadError( _(b'%s hook is invalid: "%s" is not defined') % (hname, funcname) ) if not callable(obj): raise error.HookLoadError( _(b'%s hook is invalid: "%s" is not callable') % (hname, funcname) ) ui.note(_(b"calling hook %s: %s\n") % (hname, funcname)) starttime = util.timer() try: r = obj(ui=ui, repo=repo, hooktype=htype, **pycompat.strkwargs(args)) except Exception as exc: if isinstance(exc, error.Abort): ui.warn(_(b'error: %s hook failed: %s\n') % (hname, exc.args[0])) else: ui.warn( _(b'error: %s hook raised an exception: %s\n') % (hname, stringutil.forcebytestr(exc)) ) if throw: raise if not ui.tracebackflag: ui.warn(_(b'(run with --traceback for stack trace)\n')) ui.traceback() return True, True finally: duration = util.timer() - starttime ui.log( b'pythonhook', b'pythonhook-%s: %s finished in %0.2f seconds\n', htype, funcname, duration, ) if r: if throw: raise error.HookAbort(_(b'%s hook failed') % hname) ui.warn(_(b'warning: %s hook failed\n') % hname) return r, False def _exthook(ui, repo, htype, name, cmd, args, throw): starttime = util.timer() env = {} # make in-memory changes visible to external process if repo is not None: tr = repo.currenttransaction() repo.dirstate.write(tr) if tr and tr.writepending(): env[b'HG_PENDING'] = repo.root env[b'HG_HOOKTYPE'] = htype env[b'HG_HOOKNAME'] = name for k, v in pycompat.iteritems(args): # transaction changes can accumulate MBs of data, so skip it # for external hooks if k == b'changes': continue if callable(v): v = v() if isinstance(v, (dict, list)): v = stringutil.pprint(v) env[b'HG_' + k.upper()] = v if ui.configbool(b'hooks', b'tonative.%s' % name, False): oldcmd = cmd cmd = procutil.shelltonative(cmd, env) if cmd != oldcmd: ui.note(_(b'converting hook "%s" to native\n') % name) ui.note(_(b"running hook %s: %s\n") % (name, cmd)) if repo: cwd = repo.root else: cwd = encoding.getcwd() r = ui.system(cmd, environ=env, cwd=cwd, blockedtag=b'exthook-%s' % (name,)) duration = util.timer() - starttime ui.log( b'exthook', b'exthook-%s: %s finished in %0.2f seconds\n', name, cmd, duration, ) if r: desc = procutil.explainexit(r) if throw: raise error.HookAbort(_(b'%s hook %s') % (name, desc)) ui.warn(_(b'warning: %s hook %s\n') % (name, desc)) return r # represent an untrusted hook command _fromuntrusted = object() def _allhooks(ui): """return a list of (hook-id, cmd) pairs sorted by priority""" hooks = _hookitems(ui) # Be careful in this section, propagating the real commands from untrusted # sources would create a security vulnerability, make sure anything altered # in that section uses "_fromuntrusted" as its command. untrustedhooks = _hookitems(ui, _untrusted=True) for name, value in untrustedhooks.items(): trustedvalue = hooks.get(name, ((), (), name, _fromuntrusted)) if value != trustedvalue: (lp, lo, lk, lv) = trustedvalue hooks[name] = (lp, lo, lk, _fromuntrusted) # (end of the security sensitive section) return [(k, v) for p, o, k, v in sorted(hooks.values())] def _hookitems(ui, _untrusted=False): """return all hooks items ready to be sorted""" hooks = {} for name, cmd in ui.configitems(b'hooks', untrusted=_untrusted): if name.startswith(b'priority.') or name.startswith(b'tonative.'): continue priority = ui.configint(b'hooks', b'priority.%s' % name, 0) hooks[name] = ((-priority,), (len(hooks),), name, cmd) return hooks _redirect = False def redirect(state): global _redirect _redirect = state def hashook(ui, htype): """return True if a hook is configured for 'htype'""" if not ui.callhooks: return False for hname, cmd in _allhooks(ui): if hname.split(b'.')[0] == htype and cmd: return True return False def hook(ui, repo, htype, throw=False, **args): if not ui.callhooks: return False hooks = [] for hname, cmd in _allhooks(ui): if hname.split(b'.')[0] == htype and cmd: hooks.append((hname, cmd)) res = runhooks(ui, repo, htype, hooks, throw=throw, **args) r = False for hname, cmd in hooks: r = res[hname][0] or r return r @contextlib.contextmanager def redirect_stdio(): """Redirects stdout to stderr, if possible.""" oldstdout = -1 try: if _redirect: try: stdoutno = procutil.stdout.fileno() stderrno = procutil.stderr.fileno() # temporarily redirect stdout to stderr, if possible if stdoutno >= 0 and stderrno >= 0: procutil.stdout.flush() oldstdout = os.dup(stdoutno) os.dup2(stderrno, stdoutno) except (OSError, AttributeError): # files seem to be bogus, give up on redirecting (WSGI, etc) pass yield finally: # The stderr is fully buffered on Windows when connected to a pipe. # A forcible flush is required to make small stderr data in the # remote side available to the client immediately. procutil.stderr.flush() if _redirect and oldstdout >= 0: procutil.stdout.flush() # write hook output to stderr fd os.dup2(oldstdout, stdoutno) os.close(oldstdout) def runhooks(ui, repo, htype, hooks, throw=False, **args): args = pycompat.byteskwargs(args) res = {} with redirect_stdio(): for hname, cmd in hooks: if cmd is _fromuntrusted: if throw: raise error.HookAbort( _(b'untrusted hook %s not executed') % hname, hint=_(b"see 'hg help config.trusted'"), ) ui.warn(_(b'warning: untrusted hook %s not executed\n') % hname) r = 1 raised = False elif callable(cmd): r, raised = pythonhook(ui, repo, htype, hname, cmd, args, throw) elif cmd.startswith(b'python:'): if cmd.count(b':') >= 2: path, cmd = cmd[7:].rsplit(b':', 1) path = util.expandpath(path) if repo: path = os.path.join(repo.root, path) try: mod = extensions.loadpath(path, b'hghook.%s' % hname) except Exception: ui.write(_(b"loading %s hook failed:\n") % hname) raise hookfn = getattr(mod, cmd) else: hookfn = cmd[7:].strip() r, raised = pythonhook( ui, repo, htype, hname, hookfn, args, throw ) else: r = _exthook(ui, repo, htype, hname, cmd, args, throw) raised = False res[hname] = r, raised return res